Image Resizer

How to resize an image

1. Choose a JPG, PNG, or WebP image up to 20 MB.
2. Enter exact pixel dimensions, use a percentage shortcut, or choose a social-media preset.
3. Keep the aspect-ratio lock on to preserve the original shape, or turn it off when you intentionally need independent dimensions.
4. Select the output format and JPG or WebP quality.
5. Resize, review the actual result, and download the new file.

What does image resizing change?

An image's pixel dimensions describe the number of pixels across its width and height. Resizing creates a new pixel grid and asks the browser to sample the original image into that grid. Reducing dimensions can make an image more practical for websites, email, presentations, and social posts.

Enlarging an image creates more pixels but cannot restore detail that was not present in the source. A heavily enlarged result may look soft or blocky even when its new dimensions are technically correct.

Aspect ratio and stretching

Aspect ratio is the relationship between width and height. A 1920 × 1080 image and a 1280 × 720 image both use a 16:9 ratio. With the lock enabled, changing one dimension calculates the other from the original ratio.

This version resizes the complete image and does not crop it. Selecting a fixed preset with a different ratio therefore unlocks the dimensions and displays a stretch warning. For a natural-looking fixed frame, crop the image in a dedicated editor before or after resizing.

Included image-size presets

• Instagram Square: 1080 × 1080
• Instagram Portrait: 1080 × 1350
• Facebook Post: 1200 × 630
• YouTube Thumbnail: 1280 × 720
• LinkedIn Post: 1200 × 627
• HD: 1920 × 1080

Platform recommendations and interfaces can change. Treat these presets as convenient working sizes, then review the current requirements and safe areas for the platform where you plan to publish.

JPG, PNG, or WebP?

JPG

JPG is a lossy format commonly used for photographs. It does not support transparent pixels, so this tool places transparent areas on a white background when exporting to JPG.

PNG

PNG supports transparency and is useful for graphics, interface images, and screenshots. A resized PNG can be larger than a JPG or WebP because the formats encode image data differently.

WebP

WebP supports lossy output and transparency in modern browsers. The tool verifies the actual file type returned by the browser and stops instead of giving a fallback file the wrong extension.

Privacy and processing limits

The selected file is decoded and redrawn with the browser Canvas API in the current tab. Yellow Tools does not receive the image, and results are not saved to an account or cloud library. Closing or refreshing the page removes the temporary working state.

• Maximum input file size: 20 MB.
• Maximum decoded input area: 40 megapixels.
• Maximum output dimension: 10,000 pixels per side.
• Maximum output area: 25 megapixels.
• Minimum output dimension: 1 pixel per side.

Important limitations

• Animated PNG, animated WebP, GIF, and HEIC/HEIF input are not supported.
• Version one does not crop, rotate, sharpen, or remove backgrounds.
• Canvas export may not preserve EXIF details, camera metadata, embedded color profiles, or other source metadata.
• Encoding behavior and final file size can differ slightly between browsers.
• A quality value is an encoder setting, not a guarantee of a particular visual quality or file size.

Frequently asked questions

Does resizing reduce file size?

Often, but not always. Smaller pixel dimensions usually require less image data, while output format, transparency, image complexity, and quality also affect the result. The result panel reports when a file is larger instead of calling every resize a reduction.

Will the resized image lose quality?

Resampling changes pixels, and JPG or lossy WebP encoding can discard additional detail. Review the preview and downloaded file at the size where it will actually be used.

Why was my large image rejected?

A compressed file can expand to a much larger pixel buffer when decoded. The file-size and megapixel limits reduce memory pressure and the chance of freezing a phone or browser tab.

Need production image help?

Resizing one file is straightforward; building a fast image pipeline across an entire website needs responsive sources, sensible formats, caching, accessibility, and performance testing. Yellow Solutions can help audit and improve that complete workflow.